1990–1991 Philadelphia measles outbreak
The 1990–1991 Philadelphia measles outbreak was a medical event in and around Philadelphia, Pennsylvania, in which over 1,400 people, mostly children, became sick with measles, and nine children died. There were two epicenters for this outbreak within the area: The Faith Tabernacle Congregation and the First Century Gospel Church.
Source: Wikipedia — 1990–1991 Philadelphia measles outbreak (CC BY-SA 4.0)